/Engine/Source/Runtime/Engine/Classes/Engine/World.h
Check GameMode PreLogin results and welcome player if needed.
void PreLoginComplete ( const [FString](API\Runtime\Core\Containers\FString) & ErrorMsg, [TWeakObjectPtr](API\Runtime\Core\UObject\TWeakObjectPtr)< [UNetConnection](API\Runtime\Engine\Engine\UNetConnection) > WeakConnection )